Hollow casting and method of producing same



J. H. EMERY.

HOLLOW CASTING AND METHOD OF PRODUCING SAME.

APPLICATION FILED MAY 14, 1919.

1,373,121,. Patented Man 29, 1921.

Fiq. I.

. umrlazo STATES JAMES H. EIEBY, MOBSEKERE, NEW JERSEY.

.HO L LOW CASTING AND METHOD OF PRODUCING SAME." I

Specification of Letters Patent. I Patented Mar; 29, 1921.

Application filed m 14, 1919. Serial No. 297,625.

To all whom it my concern:

Be it knownthat I, JAMES H. EMERY, a citizen of the United States, and a resident of Morsemere, New Jersey, have invented a new and useful Improvements in Hollow Castings and Methods of Producing Same, which invention is fully-set forth in the following specification.

This invention relates primarily to the novel method of casting hollow imitation of fruits or the like, as ornaments, but obviously may be employed for the production of other hollow articles. The invention will be best understood by reference to the accompanying drawings and annexed description, WlllCll disclose a preferred specific manner of practising the invention. In these drawings:

. Figure I is intended to represent a vert1- calsection through a convenient kind of two-part mold being formed around some object to be imitated, such as a plaster-of- Paris mold around an apple or an orange; Fig. II is a similar view of the same mold, after it has been completed;

Fig. III is a similar view of the same mold, with the aforesaid object removed, a charge of suitable temporarily-fluid com- .position introduced, and the two members reassembled;

Fig. IV is a perspective, intended to represent, graphically, the mold of Fig. 3 being subjected to centrifugal or gyratory motion;

Fig. V is a sectional view, showing the location assumed by the still-fluid composition during the gyratory movement indi cated by Fig. IV; and

Fig. VI 1s a similar view, showing the casting and the two parts of the mold as se arated from one another.

11 carrying out the invention, a two-part V mold or casting or matrix of the original article is first produced, in any suitable or desired manner. of any convenient or desired composition, in temporarily-fluid condition, is introduced into one of the mold-members and the other member united thereto, so that the temporaril -fluid composition is securely sealed within the cavity. Then the thus-charged mold is given such motion, either by hand .or by sultable mechanism, as to cause the temporarily-fluid contents to spread over the entire inner. surface of the inclosed cavity, and this movement 1s continued Then 'a suitable quantity until the composition, or at least the outer portion thereof has become sufficiently solidified'to retain its more or less spherical shape,that is, the shape of the cavity itself, corresponding to the shape of the original article. It will be understood that if the charged mold were merely spun around a constant linear axis, the fluid contents would accumulate in a belt or zone around the equator, as it were, while at the two poles there would be little or none of the composition. In other words, the movement should notbe a mere rotation around such linear 1 suitable boxing 1 is filled about half way up with wet sand 2 or the like, in which the article to be imitated, as an orange 3, is

embedded about half-way; and then the rest of the frame is filled with a mass 4: of plaster-of-Paris or the like. When the halfmold 4 has become set and hardened, the frame is lifted, and the sand discharged; and the whole inverted, and the now-empty upper portion of the frame filled with plaster-of-Paris 6, as seen in Fig. II. Preferably, before applying the plaster to form the second member of the mold, recesses or angular cuts, as at 5, are produced in the upper edge of the first mold-member 4; and

then the exposed upper edge of this moldmember is given suitable treatment as by an application of a mixture of kerosene and vegetable oil, to prevent the added plaster 6 from adhering to the first mold-member.

After a suitable two-part mold as 4r-6 hasbeen formed, as above set forth, or in any other suitable manner, then the two mold-members are separated, the original article 3 removed, and a sufficient quantity of a suitable temporarily-fluid composition 7 is introduced into the lower member, and the two members assembled. as indicated in Fig. III; and, preferably, one or more clamping-bands, as 8, applied to secure the members firmly together. Preferably the concave mold-surfaces should be treated to suitable mold could prevent adhesion of the composition. When the mold is of plaster-of-Paris, it has been found -suflicient to saturate it with water, cool or cold water is preferable because it facilitates the solidifymg of the composition.

It will be understood that the invention is not limited to the use of a plaster-of-Paris mold since an electro-deposited or an other be employed. A rthe mold, of whatever character, has been charged with tem rarily fluidfcomposition, as in Fig. III, it is then iven the gyratory or spherically-centrifugal movement above referred to; This may be done by any suit able mechanism, or byhand, as aphically indicated by Fig. IV. That is, t ere should be'not merely a simple rotary movement, as indicated by the broken-line orbit 9 (in a single plane), but also in at least one other orbit, such as 10, in another plane at an angle thereto. The purpose being to cause the still-fluid contents to assume the more or less s herical hollow form indicated at 7, in

ig. V,'the operation might be defined as sloshing around. This sloshing or gymtory movement is maintained for a sufiiclent time to at least the outer ortions thereof (in contact with the mold? to become solidified and set. The time required depends upon the 7 nature of the temporarilyfluid composition employed, and can low casting 7" removed.

members, and by be hastened by chilling the mold previous to introducing the comosition, or. during the gyrations thereof. referabl the initial gyrati'ons are quite rapid (w ile'the composition is still-quite fluid), and they may become slower and slower as the composition becomes more and more viscid and gradually solidifies. After sufficient time has ela sed, the mold is opened, as indicatedin igi 6, and the holhis casting can then be finished by hand, as'by removing any bur or fin that may have been formed by the meeting-surfaces of the two moldapplying any desired colors. The invention ticular composition, but can be carried out by any which can be readily rendered temporarily fluid, which will become solidified without undue delay, which will not have too great a coefiicient of expansion or contraction, which will not adhere to the mold, which will not result in cracks or cleavage members in ice-water; in which case,

permit the fluid contents, or

is not limited to any par- -ficiently cohesive and durable after it'has become set. A number of different compositions, of differing formulas, are available; but good results have been attained by using a mixture of ceresin, beeswax, and carnauba, and saturating the plaster-of-Paris 1inoldt e ybe discontinued after say t wo rations may or three minutes, but the mold should ptref- .erably be further cooled for about fi cen minutes before opening.

It will be understood that, various modifications of instrumentalities and of manipulations may be resorted to, without departin from the spirit of the invention, for examp e, the mold may consist of more than two parts.

The invention having been thus fully described in detail what is claimed is:

1. The method of producing a hollow imitation of an object, which consists of first chilling a separable mold of such object, next charging the chilled mold with a temporarily-fluid composition, then impartin a gyrator movement thereto with initia rapidity t at gradually decreases until the composition has solidified, and thereafter removing the solidified hollow casting thereby produced. 1

2. The method of producing a hollow imitation of an object, which consists of first chilling a separable mold of such object, next the chilled mold charging it with a molten composition, then imparting 'gyratory movement thereto until the composition has solidified, and thereafter removing the solidified hollow casting thereby roduced.

3. The method of producing ho low castings, which consists of 'gyrating a separable mold containing temporarily-fluid composition, with initial rapidity that gradually decreases until the composition has become solidified, and thereafter cooling the mold and its contents and removing the solidified hollow casting thereby resulting.

4. The method of producing hollow castwhich consists ofgyrating a separable chilled mold containing temporarily-fluid composition. until said composition solidifies, and thereafter removing the solidified hollow casting thereby resulting. p

In testimony whereof I have signed this specification.

' JAMES H. EMERY. 

